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<?php
/**
* File IO functions
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
*/
if(!defined('DOKU_INC')) die('meh.');
/**
* Removes empty directories
*
* Sends IO_NAMESPACE_DELETED events for 'pages' and 'media' namespaces.
* Event data:
* $data[0] ns: The colon separated namespace path minus the trailing page name.
* $data[1] ns_type: 'pages' or 'media' namespace tree.
*
* @todo use safemode hack
* @param string $id - a pageid, the namespace of that id will be tried to deleted
* @param string $basedir - the config name of the type to delete (datadir or mediadir usally)
* @return bool - true if at least one namespace was deleted
* @author Andreas Gohr <andi@splitbrain.org>
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function io_sweepNS($id,$basedir='datadir'){
global $conf;
$types = array ('datadir'=>'pages', 'mediadir'=>'media');
$ns_type = (isset($types[$basedir])?$types[$basedir]:false);
$delone = false;
//scan all namespaces
while(($id = getNS($id)) !== false){
$dir = $conf[$basedir].'/'.utf8_encodeFN(str_replace(':','/',$id));
//try to delete dir else return
if(@rmdir($dir)) {
if ($ns_type!==false) {
$data = array($id, $ns_type);
$delone = true; // we deleted at least one dir
trigger_event('IO_NAMESPACE_DELETED', $data);
}
} else { return $delone; }
}
return $delone;
}
/**
* Used to read in a DokuWiki page from file, and send IO_WIKIPAGE_READ events.
*
* Generates the action event which delegates to io_readFile().
* Action plugins are allowed to modify the page content in transit.
* The file path should not be changed.
*
* Event data:
* $data[0] The raw arguments for io_readFile as an array.
* $data[1] ns: The colon separated namespace path minus the trailing page name. (false if root ns)
* $data[2] page_name: The wiki page name.
* $data[3] rev: The page revision, false for current wiki pages.
*
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function io_readWikiPage($file, $id, $rev=false) {
if (empty($rev)) { $rev = false; }
$data = array(array($file, true), getNS($id), noNS($id), $rev);
return trigger_event('IO_WIKIPAGE_READ', $data, '_io_readWikiPage_action', false);
}
/**
* Callback adapter for io_readFile().
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function _io_readWikiPage_action($data) {
if (is_array($data) && is_array($data[0]) && count($data[0])===2) {
return call_user_func_array('io_readFile', $data[0]);
} else {
return ''; //callback error
}
}
/**
* Returns content of $file as cleaned string.
*
* Uses gzip if extension is .gz
*
* If you want to use the returned value in unserialize
* be sure to set $clean to false!
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function io_readFile($file,$clean=true){
$ret = '';
if(@file_exists($file)){
if(substr($file,-3) == '.gz'){
$ret = join('',gzfile($file));
}else if(substr($file,-4) == '.bz2'){
$ret = bzfile($file);
}else{
$ret = file_get_contents($file);
}
}
if($clean){
return cleanText($ret);
}else{
return $ret;
}
}
/**
* Returns the content of a .bz2 compressed file as string
* @author marcel senf <marcel@rucksackreinigung.de>
*/
function bzfile($file){
$bz = bzopen($file,"r");
$str = '';
while (!feof($bz)){
//8192 seems to be the maximum buffersize?
$str = $str . bzread($bz,8192);
}
bzclose($bz);
return $str;
}
/**
* Used to write out a DokuWiki page to file, and send IO_WIKIPAGE_WRITE events.
*
* This generates an action event and delegates to io_saveFile().
* Action plugins are allowed to modify the page content in transit.
* The file path should not be changed.
* (The append parameter is set to false.)
*
* Event data:
* $data[0] The raw arguments for io_saveFile as an array.
* $data[1] ns: The colon separated namespace path minus the trailing page name. (false if root ns)
* $data[2] page_name: The wiki page name.
* $data[3] rev: The page revision, false for current wiki pages.
*
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function io_writeWikiPage($file, $content, $id, $rev=false) {
if (empty($rev)) { $rev = false; }
if ($rev===false) { io_createNamespace($id); } // create namespaces as needed
$data = array(array($file, $content, false), getNS($id), noNS($id), $rev);
return trigger_event('IO_WIKIPAGE_WRITE', $data, '_io_writeWikiPage_action', false);
}
/**
* Callback adapter for io_saveFile().
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function _io_writeWikiPage_action($data) {
if (is_array($data) && is_array($data[0]) && count($data[0])===3) {
return call_user_func_array('io_saveFile', $data[0]);
} else {
return false; //callback error
}
}
/**
* Saves $content to $file.
*
* If the third parameter is set to true the given content
* will be appended.
*
* Uses gzip if extension is .gz
* and bz2 if extension is .bz2
*
* @author Andreas Gohr <andi@splitbrain.org>
* @return bool true on success
*/
function io_saveFile($file,$content,$append=false){
global $conf;
$mode = ($append) ? 'ab' : 'wb';
$fileexists = @file_exists($file);
io_makeFileDir($file);
io_lock($file);
if(substr($file,-3) == '.gz'){
$fh = @gzopen($file,$mode.'9');
if(!$fh){
msg("Writing $file failed",-1);
io_unlock($file);
return false;
}
gzwrite($fh, $content);
gzclose($fh);
}else if(substr($file,-4) == '.bz2'){
$fh = @bzopen($file,$mode{0});
if(!$fh){
msg("Writing $file failed", -1);
io_unlock($file);
return false;
}
bzwrite($fh, $content);
bzclose($fh);
}else{
$fh = @fopen($file,$mode);
if(!$fh){
msg("Writing $file failed",-1);
io_unlock($file);
return false;
}
fwrite($fh, $content);
fclose($fh);
}
if(!$fileexists and !empty($conf['fperm'])) chmod($file, $conf['fperm']);
io_unlock($file);
return true;
}
/**
* Delete exact linematch for $badline from $file.
*
* Be sure to include the trailing newline in $badline
*
* Uses gzip if extension is .gz
*
* 2005-10-14 : added regex option -- Christopher Smith <chris@jalakai.co.uk>
*
* @author Steven Danz <steven-danz@kc.rr.com>
* @return bool true on success
*/
function io_deleteFromFile($file,$badline,$regex=false){
if (!@file_exists($file)) return true;
io_lock($file);
// load into array
if(substr($file,-3) == '.gz'){
$lines = gzfile($file);
}else{
$lines = file($file);
}
// remove all matching lines
if ($regex) {
$lines = preg_grep($badline,$lines,PREG_GREP_INVERT);
} else {
$pos = array_search($badline,$lines); //return null or false if not found
while(is_int($pos)){
unset($lines[$pos]);
$pos = array_search($badline,$lines);
}
}
if(count($lines)){
$content = join('',$lines);
if(substr($file,-3) == '.gz'){
$fh = @gzopen($file,'wb9');
if(!$fh){
msg("Removing content from $file failed",-1);
io_unlock($file);
return false;
}
gzwrite($fh, $content);
gzclose($fh);
}else{
$fh = @fopen($file,'wb');
if(!$fh){
msg("Removing content from $file failed",-1);
io_unlock($file);
return false;
}
fwrite($fh, $content);
fclose($fh);
}
}else{
@unlink($file);
}
io_unlock($file);
return true;
}
/**
* Tries to lock a file
*
* Locking is only done for io_savefile and uses directories
* inside $conf['lockdir']
*
* It waits maximal 3 seconds for the lock, after this time
* the lock is assumed to be stale and the function goes on
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function io_lock($file){
global $conf;
// no locking if safemode hack
if($conf['safemodehack']) return;
$lockDir = $conf['lockdir'].'/'.md5($file);
@ignore_user_abort(1);
$timeStart = time();
do {
//waited longer than 3 seconds? -> stale lock
if ((time() - $timeStart) > 3) break;
$locked = @mkdir($lockDir, $conf['dmode']);
if($locked){
if(!empty($conf['dperm'])) chmod($lockDir, $conf['dperm']);
break;
}
usleep(50);
} while ($locked === false);
}
/**
* Unlocks a file
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function io_unlock($file){
global $conf;
// no locking if safemode hack
if($conf['safemodehack']) return;
$lockDir = $conf['lockdir'].'/'.md5($file);
@rmdir($lockDir);
@ignore_user_abort(0);
}
/**
* Create missing namespace directories and send the IO_NAMESPACE_CREATED events
* in the order of directory creation. (Parent directories first.)
*
* Event data:
* $data[0] ns: The colon separated namespace path minus the trailing page name.
* $data[1] ns_type: 'pages' or 'media' namespace tree.
*
* @author Ben Coburn <btcoburn@silicodon.net>
*/
function io_createNamespace($id, $ns_type='pages') {
// verify ns_type
$types = array('pages'=>'wikiFN', 'media'=>'mediaFN');
if (!isset($types[$ns_type])) {
trigger_error('Bad $ns_type parameter for io_createNamespace().');
return;
}
// make event list
$missing = array();
$ns_stack = explode(':', $id);
$ns = $id;
$tmp = dirname( $file = call_user_func($types[$ns_type], $ns) );
while (!@is_dir($tmp) && !(@file_exists($tmp) && !is_dir($tmp))) {
array_pop($ns_stack);
$ns = implode(':', $ns_stack);
if (strlen($ns)==0) { break; }
$missing[] = $ns;
$tmp = dirname(call_user_func($types[$ns_type], $ns));
}
// make directories
io_makeFileDir($file);
// send the events
$missing = array_reverse($missing); // inside out
foreach ($missing as $ns) {
$data = array($ns, $ns_type);
trigger_event('IO_NAMESPACE_CREATED', $data);
}
}
/**
* Create the directory needed for the given file
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function io_makeFileDir($file){
global $conf;
$dir = dirname($file);
if(!@is_dir($dir)){
io_mkdir_p($dir) || msg("Creating directory $dir failed",-1);
}
}
/**
* Creates a directory hierachy.
*
* @link http://www.php.net/manual/en/function.mkdir.php
* @author <saint@corenova.com>
* @author Andreas Gohr <andi@splitbrain.org>
*/
function io_mkdir_p($target){
global $conf;
if (@is_dir($target)||empty($target)) return 1; // best case check first
if (@file_exists($target) && !is_dir($target)) return 0;
//recursion
if (io_mkdir_p(substr($target,0,strrpos($target,'/')))){
if($conf['safemodehack']){
$dir = preg_replace('/^'.preg_quote(fullpath($conf['ftp']['root']),'/').'/','', $target);
return io_mkdir_ftp($dir);
}else{
$ret = @mkdir($target,$conf['dmode']); // crawl back up & create dir tree
if($ret && !empty($conf['dperm'])) chmod($target, $conf['dperm']);
return $ret;
}
}
return 0;
}
/**
* Creates a directory using FTP
*
* This is used when the safemode workaround is enabled
*
* @author <andi@splitbrain.org>
*/
function io_mkdir_ftp($dir){
global $conf;
if(!function_exists('ftp_connect')){
msg("FTP support not found - safemode workaround not usable",-1);
return false;
}
$conn = @ftp_connect($conf['ftp']['host'],$conf['ftp']['port'],10);
if(!$conn){
msg("FTP connection failed",-1);
return false;
}
if(!@ftp_login($conn, $conf['ftp']['user'], conf_decodeString($conf['ftp']['pass']))){
msg("FTP login failed",-1);
return false;
}
//create directory
$ok = @ftp_mkdir($conn, $dir);
//set permissions
@ftp_site($conn,sprintf("CHMOD %04o %s",$conf['dmode'],$dir));
@ftp_close($conn);
return $ok;
}
/**
* Creates a unique temporary directory and returns
* its path.
*
* @author Michael Klier <chi@chimeric.de>
*/
function io_mktmpdir() {
global $conf;
$base = $conf['tmpdir'];
$dir = md5(uniqid(mt_rand(), true));
$tmpdir = $base.'/'.$dir;
if(io_mkdir_p($tmpdir)) {
return($tmpdir);
} else {
return false;
}
}
/**
* downloads a file from the net and saves it
*
* if $useAttachment is false,
* - $file is the full filename to save the file, incl. path
* - if successful will return true, false otherwise
*
* if $useAttachment is true,
* - $file is the directory where the file should be saved
* - if successful will return the name used for the saved file, false otherwise
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Chris Smith <chris@jalakai.co.uk>
*/
function io_download($url,$file,$useAttachment=false,$defaultName='',$maxSize=2097152){
global $conf;
$http = new DokuHTTPClient();
$http->max_bodysize = $maxSize;
$http->timeout = 25; //max. 25 sec
$http->keep_alive = false; // we do single ops here, no need for keep-alive
$data = $http->get($url);
if(!$data) return false;
$name = '';
if ($useAttachment) {
if (isset($http->resp_headers['content-disposition'])) {
$content_disposition = $http->resp_headers['content-disposition'];
$match=array();
if (is_string($content_disposition) &&
preg_match('/attachment;\s*filename\s*=\s*"([^"]*)"/i', $content_disposition, $match)) {
$name = utf8_basename($match[1]);
}
}
if (!$name) {
if (!$defaultName) return false;
$name = $defaultName;
}
$file = $file.$name;
}
$fileexists = @file_exists($file);
$fp = @fopen($file,"w");
if(!$fp) return false;
fwrite($fp,$data);
fclose($fp);
if(!$fileexists and $conf['fperm']) chmod($file, $conf['fperm']);
if ($useAttachment) return $name;
return true;
}
/**
* Windows compatible rename
*
* rename() can not overwrite existing files on Windows
* this function will use copy/unlink instead
*/
function io_rename($from,$to){
global $conf;
if(!@rename($from,$to)){
if(@copy($from,$to)){
if($conf['fperm']) chmod($to, $conf['fperm']);
@unlink($from);
return true;
}
return false;
}
return true;
}
/**
* Runs an external command with input and output pipes.
* Returns the exit code from the process.
*
* @author Tom N Harris <tnharris@whoopdedo.org>
*/
function io_exec($cmd, $input, &$output){
$descspec = array(
0=>array("pipe","r"),
1=>array("pipe","w"),
2=>array("pipe","w"));
$ph = proc_open($cmd, $descspec, $pipes);
if(!$ph) return -1;
fclose($pipes[2]); // ignore stderr
fwrite($pipes[0], $input);
fclose($pipes[0]);
$output = stream_get_contents($pipes[1]);
fclose($pipes[1]);
return proc_close($ph);
}
/**
* Search a file for matching lines
*
* This is probably not faster than file()+preg_grep() but less
* memory intensive because not the whole file needs to be loaded
* at once.
*
* @author Andreas Gohr <andi@splitbrain.org>
* @param string $file The file to search
* @param string $pattern PCRE pattern
* @param int $max How many lines to return (0 for all)
* @param bool $backref When true returns array with backreferences instead of lines
* @return array matching lines or backref, false on error
*/
function io_grep($file,$pattern,$max=0,$backref=false){
$fh = @fopen($file,'r');
if(!$fh) return false;
$matches = array();
$cnt = 0;
$line = '';
while (!feof($fh)) {
$line .= fgets($fh, 4096); // read full line
if(substr($line,-1) != "\n") continue;
// check if line matches
if(preg_match($pattern,$line,$match)){
if($backref){
$matches[] = $match;
}else{
$matches[] = $line;
}
$cnt++;
}
if($max && $max == $cnt) break;
$line = '';
}
fclose($fh);
return $matches;
}